added dockerfile and updated Readme

manifest.json

@@ -1,38 +1,49 @@
 {
-  "name": "Chess Timer PWA",
-  "short_name": "Chess Timer",
-  "description": "Multi-player chess timer with carousel navigation",
-  "start_url": "/",
+  "name": "Game Timer PWA",
+  "short_name": "Game Timer",
+  "description": "Multi-player chess-like timer with carousel navigation",
+  "start_url": "/index.html",
   "display": "standalone",
   "background_color": "#f5f5f5",
   "theme_color": "#2c3e50",
   "icons": [
     {
-      "src": "android-chrome-192x192.png",
+      "src": "/icons/android-chrome-192x192.png",
       "sizes": "192x192",
-      "type": "image/png",
-      "purpose": "any maskable"
+      "type": "image/png"
     },
     {
-      "src": "android-chrome-512x512.png",
+      "src": "/icons/android-chrome-512x512.png",
       "sizes": "512x512",
-      "type": "image/png",
-      "purpose": "any maskable"
+      "type": "image/png"
     },
     {
-      "src": "apple-touch-icon.png",
+      "src": "/icons/apple-touch-icon.png",
       "sizes": "180x180",
       "type": "image/png"
     },
     {
-      "src": "favicon-32x32.png",
+      "src": "/icons/favicon-32x32.png",
       "sizes": "32x32",
       "type": "image/png"
     },
     {
-      "src": "favicon-16x16.png",
+      "src": "/icons/favicon-16x16.png",
       "sizes": "16x16",
       "type": "image/png"
     }
+  ],
+  "screenshots": [
+    {
+      "src": "/screenshots/screenshot1.png",
+      "sizes": "1302x1122",
+      "type": "image/png",
+      "form_factor": "wide"
+    },
+    {
+      "src": "/screenshots/screenshot2.png",
+      "sizes": "1082x2402",
+      "type": "image/png"
+    }
   ]
 }